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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba12c08301c892339fe4028baf68abead54def10eb801dde9a6b2a4cc165f918' 
  AND token = 'iXrWHQaYjfpmXJQ5i7NtS6U5V7TKtUYY9ioK08iTWlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}